C++11: Cannot capture `this` when trying to capture member of class in lambda function

I'm writing a simple test to see how C++11 Lambdas can be used for the purpose of maximizing code reuse. I have a function, fill_vector() and in one case I'd like it to simply fill a vector with random numbers, but in another case I'd like it to also provide me with the maximum of those numbers.

Here's what I have so far:

#include <iostream>
#include <random>
#include <vector>
#include <algorithm>
#include <iterator>

template <class Function>
void fill_vector(std::vector<int> &v, Function side)
{
    for(auto i=v.begin(); i!=v.end(); ++i)
    {
            *i = rand() % 100;
    }
    side.lambda(v);
}

class null_test
{
public:
    constexpr static auto lambda = [] (std::vector<int> x) { };
};

class test
{
public:
    test() : max(0) { } 

    int max;
    static auto lambda = [=] (std::vector<int> x) { max = 
        std::max_element(x.begin(),x.end()); };
};

int main()
{
    std::vector<int> v(20);
    null_test n;
    fill_vector(v,n);

    std::copy(v.begin(),v.end(),std::ostream_iterator<int>(std::cout," "));

    std::cout << std::endl;

    std::vector<int> v2(20);
    test t;
    fill_vector(v2,t);
    std::copy(v.begin(),v.end(),std::ostream_iterator<int>(std::cout," "));
    std::cout << std::endl;
    std::cout << t.max << std::endl;

    return 0;
}

Which results in the error: ‘this’ was not captured for this lambda function, pointing at my lambda defined in test. I've tried all sorts of capture statements and can't seem to get anything to work. What am I missing?

Also, is it possible to use a lambda inside the loop of fill_vector that could, say, extract every nth element filled? My goal here is to be able to reuse a function like fill_vector as much as possible for other functions that might need slight variations of it in a bigger project.